extern int power(int, int);
extern int is_symbol(char_t);
extern void replace_all(char *, char, char);
extern void cleanup_path(char *, char *);
extern char_t is_bracket(char_t, int);
extern point_t find_matching_bracket(buffer_t *, window_t *, int, int);
extern const char unctrl(char_t);
